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Question number: 1

Question

When a cell of emf E and internal resistance r, is connected to the ends of a resistance R, then current through resistance is I. If the same cell is connected to the ends of a resistance Equation then the current would be

Choices

Question number: 3

Question

In a potentiometer experiment two cells of emf E1 and E 2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E2 is reversed, then the balancing length becomes 29 cm.

The ratio Equation of the emf of the two cells is

Choices

Choice (4)

Response

a.

4: 1

b.

1: 1

c.

2: 1

d.

3: 1

Question number: 4

Question

An electric kettle has two heating coils. When one of the coils is switched on, the water begins to boil in 6 minutes. When the other is switched on, the boiling begins in 8 minutes. The time when the boiling begins if both coils are switched on simultaneously is (i) in series (ii) in parallel. (Specific heat of the water is 4.2 joules/gram 0 C)

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